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Papers by phuc mac

Progress in Organic Coatings, 2022

Progress in Organic Coatings, 2019

In this work, Fe 3 O 4-Ag hybrid nanoparticles were homogeneously dispersed into acrylic polyuret... more In this work, Fe 3 O 4-Ag hybrid nanoparticles were homogeneously dispersed into acrylic polyurethane matrix at a concentration of 0.1% (by the total weight of acrylic polyols and polyisocyanates). The curing process of this nanocomposite coating has been investigated by monitoring the change of coating hardness and variation of isocyanate/urethane groups (through their optical density in IR analysis) and gel fraction analysis. The surface morphology and mechanical properties of the nanocomposite coating were characterized. The antibacterial test was performed by monitoring the bacterial lag-log growth phase with the presence of nanocomposite coating in the E. coli cell culture reactor. The IR and relative hardness analysis datas indicated that the full curing time of nanocomposite coating was 6 days. The results of IR, coating hardness and gel fraction measurements indicated that crosslinking process of coating was insignificantly affected by the presence of Fe 3 O 4-Ag hybrid nanoparticles. The incorporation of hybrid nanoparticles into the acrylic polyurethane coating increased its adhesion (from 2.15 to 2.21 N/mm 2) and its impact resistance (from 110 to 125 Kg. cm −1). The antibacterial test showed that the presence of nanocomposite coating exhibited good antibacterial activity against E. coli, whereas no antibacterial activity was observed for the neat coating.

Progress in Organic Coatings, 2017

In this study, the high UV-shielding nanocomposite coatings based on pure acrylic emulsion and R-... more In this study, the high UV-shielding nanocomposite coatings based on pure acrylic emulsion and R-TiO 2 /or ZnO nanoparticles were successfully prepared. The effect of the nanoparticles on the photostability and UV shielding efficiency has been studied by using a UV/condensation weathering chamber equipped with UVB-313 fluorescent lamps. The obtained results showed that the coatings with the 2 wt% R-TiO 2 /or ZnO nanoparticles and a thickness of 45 m have the highest UV-shielding and photostability. These coatings could shield more than 98% (for R-TiO 2) and 85% (for ZnO) of UV radiations in wavelength range from 230 to 380 nm. After 60 cycles of UV/CON exposure, color of coating samples protected by the R-TiO 2 and ZnO nanocomposite coatings change insignificantly, their adhesion only decreased slightly, from their initial values of 2.5 and 2.4 to the values of 2.3 and 2.1 N/mm 2 , respectively. These nanocomposite coatings have possibly a promising potential for UV shielding applications.

Advances in Natural Sciences: Nanoscience and Nanotechnology, 2016

This study aims to enhance the mechanical properties, thermal stability, weathering resistance an... more This study aims to enhance the mechanical properties, thermal stability, weathering resistance and antibacterial property of a styrene acrylic polyurethane coating by adding rutile titania dioxide (R-TiO2) nanoparticles in coating formulation. The styrene acrylic polyurethane/R-TiO2 nanocomposite had been prepared by using ultrasonication. The effects of nanoparticles on the mechanical properties, thermal stability and weathering resistance of as-prepared coatings were investigated by using the adhesion strength and ball impact tests, the Fourier transform infrared and UV–vis analyses, thermogravimetric analysis (TGA), and UV/condensation weathering chamber equipped with UVA-340 fluorescent lamps, respectively. The disperse quality of nanoparticles in the coating was examined by using the field emission scanning electron microscope (FESEM). The mechanical test results showed that suitable content of R-TiO2 nanoparticles in the nanocomposite coating was 2 wt%. The FESEM images indicated that the nanoparticles were dispersed homogeneously into the entire volume of the coating. For the nanocomposite prepared by 3 h of ultrasonication, the average size of nanoparticles was in range of 40–50 nm. The ball impact and adhesion tests showed that the incorporation of nanoparticles into the coating significantly enhanced the impact strength from 120 to 145 kg cm and increased the adhesion from level 1 to level 0. The TGA test illustrated that in presence of nanoparticles, the decomposition temperature of coating increased from 146.9 °C to 154.21 °C. For the temperature at 50% loss in mass (T 50%), it was found that the T 50% of the neat coating is 351.86 °C. Adding the 2 wt% R-TiO2 nanoparticles into coating increased the T 50% value to 360.06 °C. After UV/condensation accelerated weathering test (30 cycles), the significant improvement in weight loss, impact strength and adhesion of the neat coating was observed with the presence of nanoparticles. The antibacterial test showed that in the nanocomposite coating, R-TiO2 nanoparticles exhibited their photocatalytic effect in the inhibition against E. coli bacterial growth. Incorporating 2 wt% of R-TiO2 nanoparticles into the coating reduced the bacterial concentration by 6.1% after 60 min of culture.

Vietnam Journal of Science and Technology, 2018

Aging of waterborne paint on the base of acrylic resin emulsion with and without green Luconyl ha... more Aging of waterborne paint on the base of acrylic resin emulsion with and without green Luconyl have been investigated by general appearance assessment, adhesion change, FT-IR and discoloration. The obtained results showed that the both of paint-formulas coatings had no cracks, blisters, flacks and there was no change of adhesion during the aging process. However, IR analysis indicated that there were some changes in chemical structures of coating with and without Green Luconyl during aging process. To specify, IR spectrums of initial and aged coating no containing Green Luconyl illustrated aging process led content of O-H and C=C increased significantly but baseline of spectra was fairly unchanged. For coating filled Green Luconyl, IR spectrums’ shape was fairly stable but baseline saw a clear reduce during accelerated weather exposure. Moreover, SEM images indicated that surfaces morphology of samples changed differently depending on in presence of organic pigment. Surface of aged ...

 Bé sơ sinh thích được quấn trong chăn  Mẹ cần một chiếc địu tốt cho bé cảm giác an toàn  Bé t... more  Bé sơ sinh thích được quấn trong chăn  Mẹ cần một chiếc địu tốt cho bé cảm giác an toàn  Bé thích nằm trên tấm thảm êm ái nhiều màu sắc  Tắm cho bé sơ sinh đúng cách  Mẹ nên mua chậu tắm lớn  Bé cần nhiều loại khăn tắm  Có nên dùng miếng lót sơ sinh 24/24?  Mẹ có nên hút mũi cho bé?  Những lưu ý khi cắt móng tay cho bé  Cách dỗ bé ngủ ngoan  Cho bé uống loại sữa nào?  Chọn vật dụng cá nhân cần thiết  Giúp bé bớt khó chịu khi mọc răng  Chọn đồ chơi nào phù hợp với bé?

Different types of polymeric materials have been made more resistant to photodegradation by prote... more Different types of polymeric materials have been made more resistant to photodegradation by protecting their surface with a UV-cured coating containing a HALS radical scavenger and a phenyltriazine UV absorber. The tridimensional polymer network formed by photopolymerization of an aliphatic polyurethane-acrylate telechelic oligomer proved to be very resistant to accelerated weathering in the presence of these light stabilizers. The chemical modifications occurring upon QUV-ageing were monitored by infrared spectroscopy, a very sensitive technique well suited for quantitative analysis at an early stage of the photodegradation. r

Progress in Organic Coatings, 2022

Progress in Organic Coatings, 2019

In this work, Fe 3 O 4-Ag hybrid nanoparticles were homogeneously dispersed into acrylic polyuret... more In this work, Fe 3 O 4-Ag hybrid nanoparticles were homogeneously dispersed into acrylic polyurethane matrix at a concentration of 0.1% (by the total weight of acrylic polyols and polyisocyanates). The curing process of this nanocomposite coating has been investigated by monitoring the change of coating hardness and variation of isocyanate/urethane groups (through their optical density in IR analysis) and gel fraction analysis. The surface morphology and mechanical properties of the nanocomposite coating were characterized. The antibacterial test was performed by monitoring the bacterial lag-log growth phase with the presence of nanocomposite coating in the E. coli cell culture reactor. The IR and relative hardness analysis datas indicated that the full curing time of nanocomposite coating was 6 days. The results of IR, coating hardness and gel fraction measurements indicated that crosslinking process of coating was insignificantly affected by the presence of Fe 3 O 4-Ag hybrid nanoparticles. The incorporation of hybrid nanoparticles into the acrylic polyurethane coating increased its adhesion (from 2.15 to 2.21 N/mm 2) and its impact resistance (from 110 to 125 Kg. cm −1). The antibacterial test showed that the presence of nanocomposite coating exhibited good antibacterial activity against E. coli, whereas no antibacterial activity was observed for the neat coating.

Progress in Organic Coatings, 2017

In this study, the high UV-shielding nanocomposite coatings based on pure acrylic emulsion and R-... more In this study, the high UV-shielding nanocomposite coatings based on pure acrylic emulsion and R-TiO 2 /or ZnO nanoparticles were successfully prepared. The effect of the nanoparticles on the photostability and UV shielding efficiency has been studied by using a UV/condensation weathering chamber equipped with UVB-313 fluorescent lamps. The obtained results showed that the coatings with the 2 wt% R-TiO 2 /or ZnO nanoparticles and a thickness of 45 m have the highest UV-shielding and photostability. These coatings could shield more than 98% (for R-TiO 2) and 85% (for ZnO) of UV radiations in wavelength range from 230 to 380 nm. After 60 cycles of UV/CON exposure, color of coating samples protected by the R-TiO 2 and ZnO nanocomposite coatings change insignificantly, their adhesion only decreased slightly, from their initial values of 2.5 and 2.4 to the values of 2.3 and 2.1 N/mm 2 , respectively. These nanocomposite coatings have possibly a promising potential for UV shielding applications.

Advances in Natural Sciences: Nanoscience and Nanotechnology, 2016

This study aims to enhance the mechanical properties, thermal stability, weathering resistance an... more This study aims to enhance the mechanical properties, thermal stability, weathering resistance and antibacterial property of a styrene acrylic polyurethane coating by adding rutile titania dioxide (R-TiO2) nanoparticles in coating formulation. The styrene acrylic polyurethane/R-TiO2 nanocomposite had been prepared by using ultrasonication. The effects of nanoparticles on the mechanical properties, thermal stability and weathering resistance of as-prepared coatings were investigated by using the adhesion strength and ball impact tests, the Fourier transform infrared and UV–vis analyses, thermogravimetric analysis (TGA), and UV/condensation weathering chamber equipped with UVA-340 fluorescent lamps, respectively. The disperse quality of nanoparticles in the coating was examined by using the field emission scanning electron microscope (FESEM). The mechanical test results showed that suitable content of R-TiO2 nanoparticles in the nanocomposite coating was 2 wt%. The FESEM images indicated that the nanoparticles were dispersed homogeneously into the entire volume of the coating. For the nanocomposite prepared by 3 h of ultrasonication, the average size of nanoparticles was in range of 40–50 nm. The ball impact and adhesion tests showed that the incorporation of nanoparticles into the coating significantly enhanced the impact strength from 120 to 145 kg cm and increased the adhesion from level 1 to level 0. The TGA test illustrated that in presence of nanoparticles, the decomposition temperature of coating increased from 146.9 °C to 154.21 °C. For the temperature at 50% loss in mass (T 50%), it was found that the T 50% of the neat coating is 351.86 °C. Adding the 2 wt% R-TiO2 nanoparticles into coating increased the T 50% value to 360.06 °C. After UV/condensation accelerated weathering test (30 cycles), the significant improvement in weight loss, impact strength and adhesion of the neat coating was observed with the presence of nanoparticles. The antibacterial test showed that in the nanocomposite coating, R-TiO2 nanoparticles exhibited their photocatalytic effect in the inhibition against E. coli bacterial growth. Incorporating 2 wt% of R-TiO2 nanoparticles into the coating reduced the bacterial concentration by 6.1% after 60 min of culture.

Vietnam Journal of Science and Technology, 2018

Aging of waterborne paint on the base of acrylic resin emulsion with and without green Luconyl ha... more Aging of waterborne paint on the base of acrylic resin emulsion with and without green Luconyl have been investigated by general appearance assessment, adhesion change, FT-IR and discoloration. The obtained results showed that the both of paint-formulas coatings had no cracks, blisters, flacks and there was no change of adhesion during the aging process. However, IR analysis indicated that there were some changes in chemical structures of coating with and without Green Luconyl during aging process. To specify, IR spectrums of initial and aged coating no containing Green Luconyl illustrated aging process led content of O-H and C=C increased significantly but baseline of spectra was fairly unchanged. For coating filled Green Luconyl, IR spectrums’ shape was fairly stable but baseline saw a clear reduce during accelerated weather exposure. Moreover, SEM images indicated that surfaces morphology of samples changed differently depending on in presence of organic pigment. Surface of aged ...

 Bé sơ sinh thích được quấn trong chăn  Mẹ cần một chiếc địu tốt cho bé cảm giác an toàn  Bé t... more  Bé sơ sinh thích được quấn trong chăn  Mẹ cần một chiếc địu tốt cho bé cảm giác an toàn  Bé thích nằm trên tấm thảm êm ái nhiều màu sắc  Tắm cho bé sơ sinh đúng cách  Mẹ nên mua chậu tắm lớn  Bé cần nhiều loại khăn tắm  Có nên dùng miếng lót sơ sinh 24/24?  Mẹ có nên hút mũi cho bé?  Những lưu ý khi cắt móng tay cho bé  Cách dỗ bé ngủ ngoan  Cho bé uống loại sữa nào?  Chọn vật dụng cá nhân cần thiết  Giúp bé bớt khó chịu khi mọc răng  Chọn đồ chơi nào phù hợp với bé?

Different types of polymeric materials have been made more resistant to photodegradation by prote... more Different types of polymeric materials have been made more resistant to photodegradation by protecting their surface with a UV-cured coating containing a HALS radical scavenger and a phenyltriazine UV absorber. The tridimensional polymer network formed by photopolymerization of an aliphatic polyurethane-acrylate telechelic oligomer proved to be very resistant to accelerated weathering in the presence of these light stabilizers. The chemical modifications occurring upon QUV-ageing were monitored by infrared spectroscopy, a very sensitive technique well suited for quantitative analysis at an early stage of the photodegradation. r